Here is what some are saying about the AuriCap:

"I liked the UltraVerve preamplifier, and I really liked the upgraded unit. It is detailed but musical. The Auricap upgrade is a very worthwhile move in the direction of music for minimal cost."

Positive Feedback - March '04 - Francisco Duran - deHavilland UltraVerve preamplifier

"The Auricapped 21A sounds fundamentally neutral, but its presentation has notable bloom and, as with the very best tube preamps, the ability to portray space -- around performers and as an entity itself. Its sound is spacious. There is no tubey glaze, but also no etch or edge. Instead, there is clarity, vigor, and grace. Nobody will say the 21A is laid-back, but it doesn't sound forward either. It walks the line of perspective as few preamps do, tipping neither one way nor the other. Its performance is accomplished -- very detailed and very enjoyable."

SoundStage - Belles 21A Preamplifier with Auricap Upgrade - Marc Mickelson - June '04